I am going to use XFree86 to enable my C program to set all properties a screen can have, i.e. resolution, frequency, horizontal and vertical sync and front and back porch, etc.

I have found some interesting functions though: XF86VidModeSwitchToMode, XF86VidModeModModeLine, XF86VidModeGetModeLine and XF86VidModeValidateModeLine. Also the very similar structs XF86VidModeModeLine and XF86VidModeModeInfo could be useful.

Is there some good tutorial for teaching me how to do this? All information I have found is quite insufficient, and I can't figure it out on myself.

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